SpencerGulfCanal
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== Arguments For == |
== Arguments For == |
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* Extra water in Australia's interior will vastly increase the possible land use |
* Extra water in Australia's interior will vastly increase the possible land use |
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| − | ** evaporation -> clouds -> rainfall on the western dividing range |
+ | ** evaporation -> clouds -> rainfall on the western dividing range. (note that this cycle would rely on inflow from the ocean for a long period. The hope however is that longer-term the altered local ecosystem would begin to be more self-sustaining) |
* There has been an inland sea there before (approx 100million years ago), so who is to say that environmental preservation should preserve the 'now' over the 'then'? |
* There has been an inland sea there before (approx 100million years ago), so who is to say that environmental preservation should preserve the 'now' over the 'then'? |
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Revision as of 09:47, 6 January 2009
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There have been proposals in the past (by nutters) to build a canal from Spencer Gulf to permenantly fill Lake Eyre and Lake Torrens.
This page is for brainstorming this idea, with an eye towards the following rational to do so.
In an environmentally sound planet, this idea is insane, as it fundamentally will alter the climate if Australia's dry interior. However, in these times of global climate change, might we assume that this interior climate will change regardless. Therefore that reason for dismissing ideas such as this are no longer valid. Should we reconsider? ...discuss
What
The basic idea is a canal to Lake Torrens which is approximately 100km overland from sea. Lake Torrens has been naturally dry for all but one of the last 150 years of white settlement in the area. This lake, if filled, would then provide vast amounts of water (saline, but evaporation/precipitation would bring clean water) to the area. A further canal to Lake Eyre would easily fill this below-sea-level lake to become permenantly full. (currently it has water approximately one year in three)
Places
- Lake Torrens
- Unknown elevation
- Lake Eyre
- Below sea level
- Lake Frome
- Below sea level
How
- A 'sea canal' from the top of Spencer Gulf would link sea waters to Lake Torrens. Approximately 50km in length.
- A 'lakes canal' to link Lake Torrens to Lake Eyre. Approximately 80km in length.
This would be an engineering work in the same magnitude as the Panama and Suez canals.
Note that Lake Torrens appears to be above sea level!
Arguments For
- Extra water in Australia's interior will vastly increase the possible land use
- evaporation -> clouds -> rainfall on the western dividing range. (note that this cycle would rely on inflow from the ocean for a long period. The hope however is that longer-term the altered local ecosystem would begin to be more self-sustaining)
- There has been an inland sea there before (approx 100million years ago), so who is to say that environmental preservation should preserve the 'now' over the 'then'?
Arguments Against
- Haven't we done enough damage?
- unpredictable outcome
- massive money spent
- extra water in the Australian interior does not nescessarily make the land any more fertile. Most of the land in Australia has poor quality soil, regardless of water availability.
- would the inflow of sea water INCREASE the local salinity levels?
- ALOT of water from the ocean is needed to offset current levels of evaporation!
Alternative: Lake Frome
According to the sea level predictor (linked below), Lake Torrens is at least 14m above sea level. However Lake Frome to the east is below sea level, as are several connecting lakes between Frome and Eyre. The Frome canal would appear to be a larger undertaking than either canals around Lake Torrens however, and the terrain skirting the southern edge of the flinders ranges may by more difficult. In addition, one of the lakes between Frome and Eyre is Lake Callabonna - which is a fossil reserve.
Nonetheless, it is an attractive alternative purely by virtue of it's elevation. Plus, it may be a fair assumption that if Lake Eyre was full, that the change in climate/rainfall in the local area may flood these lakes routinely anyway, in which case they may as well be a deliberate part of the cycle.
